Electric polarization of magnetic textures: New horizons of micromagnetism

Abstract

a b s t r a c tA common scenario of magnetoelectric coupling in multiferroics is the electric polarization induced by spatially modulated spin structures. It is shown in this paper that the same mechanism works in magnetic dielectrics with inhomogeneous magnetization distribution: the domain walls and magnetic vortexes can be the sources of electric polarization. The electric field driven magnetic domain wall motion is observed in iron garnet films. The electric field induced nucleation of vortex state of magnetic nanodots is theoretically predicted and numerically simulated. From the practical point of view the electric field control of micromagnetic structures suggests a low-power approach for spintronics and magnonics.

Dual ferroic properties of hexagonal ferrite ceramics BaFe12O19 and SrFe12O19

“…Then, the bond O2-Fe-O4 is no longer a straight line forming an open angle and inducing the spontaneous polarization. In addition, a non-uniform magnetization within the magnetic domain walls can also serve as a source of electric polarization similar to spatially modulated spin structures [34]. The 180°-domain walls are pinned at the ferrite grain boundaries by non-magnetic insulator.…”

Large-Pore Mesoporous Ho3Fe5O12 Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing

“…[4][5][6] Among them are solution-processing routes such as solvothermal and sol-gel methods, physical deposition techniques, mechanochemical approaches, and others. [7][8][9][10][11] As for thin films, materials with a perpendicular magnetic anisotropy have been the subject of significant interest over the past decade due to their potential for application in nanomagnetics [12][13][14] (e.g., as storage/recording media) and spintronics [15][16][17] (e.g., as spin valves). Nevertheless, they are also highly interesting from the viewpoint of basic research.…”

Polarizability of electrically induced magnetic vortex “atoms”

“…[6,13]). An electric field is produced by the tip of a cantilever with a fixed point charge −Q tip < 0.…”

“…The use of domain walls and other topological defects in multiferroics [2] for magnetic storage are very promising since they provide a mechanism of very dense packing of information, while topological nature protects information from loss under the influence of external perturbations such as heating or mechanical action. Among the bright examples of such topological defects are skyrmion lattices [3], as well as individual skyrmions observed in magnetoelectric materials [4], magnetic vortices [5,6], and domain walls [7,8].…”